Sorry, no online dictionaries contain the exact phrase not sincere.
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Reverse dictionary results:
1. insincere
 2. dishonest
3. deceitful
4. untruthful
5. dissembling
6. deceptious
7. dissemblance
8. fraudulent
9. prevarication
10. covinous
 11. deceit
12. delusory
13. duplicitous
14. false
15. falsehood
16. mendacious
17. mendaciousness
18. mendacity
19. perjurious
20. self-deceit
 21. accismus
22. deceptive
23. dolose
24. double
25. fallacious
26. falshood
27. illusion
28. lying
29. malaprop
30. mistruth
 31. self-deception
32. untruth
33. bad
34. deceitfully
35. delusion
36. design
37. devious

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